Qt 6.2
Licenses Used in Qt
Qt 6.2.0 Reference Documentation

Licenses Used in Qt

Qt contains some code that is not provided under the GNU Lesser General Public License (LGPL) or the Qt Commercial License, but rather under specific licenses from the original authors.

The Qt Company gratefully acknowledges these and other contributions to Qt. We recommend that programs that use Qt also acknowledge these contributions, and quote these license statements in an appendix to the documentation.

Note: You only need to comply with (and acknowledge) the licenses of the third-party components that you are using with your application. Click the name of the component to see the licensing details.

Third-party Licenses

The following table lists parts (modules) of Qt 6.2.0 that incorporate code licensed under third-party open-source licenses:

Qt 3D

Dear ImGui - ProggyClean.ttf	MIT License
Dear ImGui - stb	MIT License or Public Domain
Dear ImGui, version v1.66b	MIT License

Qt 5 Core Compatibility APIs

Text Codec: EUC-JP	BSD 2-clause "Simplified" License
Text Codec: EUC-KR	BSD 2-clause "Simplified" License
Text Codec: GBK	BSD 2-clause "Simplified" License
Text Codec: ISO 2022-JP (JIS)	BSD 2-clause "Simplified" License
Text Codec: Shift-JIS	BSD 2-clause "Simplified" License
Text Codec: TSCII	BSD 2-clause "Simplified" License
Text Codecs: Big5, Big5-HKSCS	BSD 2-clause "Simplified" License

Qt Bluetooth

BlueZ

GNU General Public License v2.0 only (This does not force user code to be GPL'ed. For more info see details.)

Qt Core

BLAKE2 (reference implementation), version 54f4faa4c16ea34bcd59d16e8da46a64b259fc07	Creative Commons Zero v1.0 Universal or Apache License 2.0
Data Compression Library (zlib), version 1.2.11	Zlib License
Easing Equations by Robert Penner	BSD 3-clause "New" or "Revised" License
Efficient Binary-Decimal and Decimal-Binary Conversion Routines for IEEE Doubles, version 3.1.5-30-gbf46072	BSD 3-clause "New" or "Revised" License
FreeBSD strtoll and strtoull, version 18b29f3fb8abee5d57ed8f4a44f806bec7e0eeff	BSD 3-clause "New" or "Revised" License
KWin, version 5.13.4	BSD-3-Clause
KWin, version 5.13.4	BSD-3-Clause
KWin, version 5.13.4	BSD-3-Clause
MD4	Public Domain
MD5	Public Domain
PCRE2 - Stack-less Just-In-Time Compiler, version 10.37	BSD 2-clause "Simplified" License
PCRE2, version 10.37	BSD 3-clause "New" or "Revised" License
QEventDispatcher on macOS	BSD 3-clause "New" or "Revised" License
Secure Hash Algorithm SHA-1	Public Domain
Secure Hash Algorithm SHA-3 - Keccak, version 3.2	Creative Commons Zero v1.0 Universal
Secure Hash Algorithm SHA-3 - brg_endian, version https://github.com/BrianGladman/sha/ commit 4b9e13ead2c5b5e41ca27c65de4dd69ae0bac228	BSD 2-clause "Simplified" License
Secure Hash Algorithms SHA-384 and SHA-512	BSD 3-clause "New" or "Revised" License
SipHash Algorithm	Creative Commons Zero v1.0 Universal
The Public Suffix List, version d4e247a71d1b6da08dad906b098c818493166fcc, fetched on 2021-06-11	Mozilla Public License 2.0
TinyCBOR, version 0.6+patches	MIT License
Unicode Character Database (UCD), version 26	Unicode License Agreement - Data Files and Software (2016)
Unicode Common Locale Data Repository (CLDR), version v39	Unicode License Agreement - Data Files and Software (2016)
extra-cmake-modules, version 5.84.0	BSD-3-Clause
extra-cmake-modules, version 5.84.0	BSD-3-Clause
extra-cmake-modules, version 5.84.0	BSD-3-Clause
forkfd	MIT License

Qt D-Bus

libdus-1 headers, version dbus-1.13.12

Academic Free License v2.1, or GNU General Public License v2.0 or later

Qt GUI

Adobe Glyph List For New Fonts, version 1.7	BSD 3-Clause "New" or "Revised" License
Anti-aliasing rasterizer from FreeType 2	Freetype Project License or GNU General Public License v2.0 only
Bitstream Vera Font, version 1.10	Bitstream Vera Font License
Cocoa Platform Plugin	BSD 3-clause "New" or "Revised" License
DejaVu Fonts, version 2.37	Bitstream Vera Font License
Freetype 2 - Bitmap Distribution Format (BDF) support	MIT License
Freetype 2 - Portable Compiled Format (PCF) support	MIT License
Freetype 2 - zlib	Zlib License
Freetype 2, version 2.10.4	Freetype Project License or GNU General Public License v2.0 only
HarfBuzz-NG, version 2.9.0	MIT License
IAccessible2 IDL Specification, version 1.3.0	BSD 3-clause "New" or "Revised" License
LibJPEG-turbo, version 2.1.1	Independent JPEG Group License and BSD 3-Clause "New" or "Revised" License and zlib License
LibPNG, version 1.6.37	Libpng License and PNG Reference Library version 2
MD4C, version 0.4.8	MIT License
Native Style for Android	Apache License 2.0
OpenGL ES 2 Headers, version Revision 27673	MIT License
OpenGL Headers, version Revision 27684	MIT License
Pixman, version 0.17.12	MIT License
Smooth Scaling Algorithm	BSD 2-clause "Simplified" License and Imlib2 License
Vulkan API Registry, version 1.2.166	MIT License
Vulkan Memory Allocator, version 2.3.0	MIT License
WebGradients	MIT License
Wintab API	LCS-Telegraphics License
X Server helper	X11 License and Historical Permission Notice and Disclaimer
XCB-XInput	MIT License
sRGB color profile icc file	International Color Consortium License

Qt Image Formats

TIFF Software Distribution (libtiff), version 4.3.0	Libtiff License
WebP (libwebp), version 1.2.1	BSD 3-clause "New" or "Revised" License

Qt OPC UA

Open62541, version 1.1	Mozilla Public License 2.0
Open62541, version 1.1	Creative Commons CCZero 1.0 Universal License
Open62541, version 1.1	Mozilla Public License 2.0

Qt Positioning

Clip2Tri Polygon Triangulation Library	MIT License
Clipper Polygon Clipping Library, version 6.4.2	Boost Software License 1.0
Poly2Tri Polygon Triangulation Library	BSD 3-clause "New" or "Revised" License

Qt QML

JavaScriptCore Macro Assembler

BSD 2-clause "Simplified" License

Qt Quick 3D

Open Asset Import Library, version 5.0.1	BSD 3-clause "New" or "Revised" Licensee
xatlas, version a8ffc484335ecc3819c69e1749f142e75e03acdf	MIT License

Qt Quick Controls

Shadow values from Angular Material

MIT License

Qt SQL

SQLite, version 3.36.0

Public Domain

Qt SVG

XSVG	Historical Permission Notice and Disclaimer - sell variant

Qt Test

Catch2, version 2.11.1	Boost Software License 1.0
Cycle	MIT License
Linux Performance Events, version 3.7	GNU General Public License v2.0 only with Linux Syscall Note
Valgrind, version 3.14.0	BSD 4-clause "Original" or "Old" License

Qt Virtual Keyboard

OpenWnn	Apache License 2.0
PinyinIME	Apache License 2.0
Traditional Chinese IME (tcime)	Apache License 2.0 and BSD 3-clause "New" or "Revised" License

Qt Wayland Compositor

Wayland EGLStream Controller Protocol, version 1.1.1	MIT License
Wayland Fullscreen Shell Protocol, version unstable v1	MIT License
Wayland IVI Extension Protocol, version 1.9.1	MIT License
Wayland Linux Dmabuf Unstable V1 Protocol, version unstable v1, version 3	MIT License
Wayland Pointer Gestures Protocol, version unstable v1, version 2	MIT License
Wayland Primary Selection Protocol, version 1	MIT License
Wayland Protocol, version 1.16.0	MIT License
Wayland Scaler Protocol, version 2	MIT License
Wayland Tablet Protocol, version unstable v2, version 1	MIT License
Wayland Text Input Protocol, version unstable v2	HPND License
Wayland Viewporter Protocol, version 1	MIT License
Wayland XDG Output Protocol, version unstable v1, version 3	MIT License
Wayland XDG Shell Protocol, version 1.18	MIT License
Wayland xdg-decoration Protocol, version unstable v1, version 1	MIT License

Qt WebEngine

Chromium License

BSD

Shader Tools

SPIRV-Cross, version d137abeef57b2f3fdbdab0ad5590fe99a44ba546	Apache License 2.0 and Khronos License
glslang, version 11.1.0	BSD 3-Clause "New" or "Revised" License, and Khronos License, and Apache License 2.0, and GNU General Public License v3.0 or later with Bison exception 2.2, and NVIDIA 2002 License

Additional Information

The following table lists related documents, such as information about Trademarks and other licenses used in parts of Qt.

Android GNU C++ Run-time Licensing	Provides additional information about the licensing of run-time dependencies of Qt for Android
LLVM Attribution	University of Illinois/NCSA Open Source License, BSD licenses
License Changes	Information about changes of licenses in Qt and Third Party Modules
Macros for Building with CMake	BSD 3-clause "New" or "Revised" License
Mesa llvmpipe	MIT License
Notes about PDF Licensing	Details of restrictions on the use of PDF-related trademarks
The QtEntryPoint Library	Commercial and BSD 3-clause "New" or "Revised" License.
Trademarks	Information about trademarks owned by The Qt Company and other organizations.